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11 S E C O R ._ _. .. <br /> TABLE OF CONTENTS <br /> • 1.0 SITE DESCRIPTION .........................................................................................................1 <br /> 2.0 SUMMARY OF PREVIOUS INVESTIGATIONS AND REMEDIAL ACTION......................2 <br /> 3.0 SITE GEOLOGY AND HYDROGEOLOGY.......................................................................8 <br /> 4.0 FIRST QUARTER 2008 MONITORING AND SAMPLING.................................................9 <br /> 4.1 Groundwater Monitoring and Sampling Procedures ..................................................9 <br /> 4.2 Laboratory Analysis...................................................................................................9 <br /> 4.3 First Quarter 2008 Shallow Groundwater Results.................................................... 10 <br /> 4.3.1 Shallow Zone Groundwater Gradient........................................................... 10 <br /> 4.3.2 Shallow Zone Groundwater Quality Data..................................................... 10 <br /> 4.3.3 SPH............................................................................................................. 11 <br /> 4.3.3.1 TPHg, TPHd, TPHo, and Fuel Oxygenates................................... 11 <br /> 4.3.3.2 VOCs ............................................................................................ 12 <br /> 4.3.3.3 SVOCs.......................................................................................... 13 <br /> 4.3.3.4 Dissolved Metals........................................................................... 13 <br /> 4.3.3.5 QA/QC Samples............................................................................ 13 <br /> 4.3.3.6 General Laboratory Notes............................................................. 14 <br /> 4.4 First Quarter 2008 Deeper Groundwater Results .................................................... 16 <br /> 4.4.1 Deep Zone (B, C, and D-Zone) Groundwater Gradient................................ 16 <br /> 4.4.2 Deep Zone Groundwater Quality Data......................................................... 16 <br /> 4.4.2.1 SPH .............................................................................................. 16 <br /> 4.4.2.2 TPHg, TPHd, TPHo, and Fuel Oxygenates................................... 17 <br /> 4.4.2.3 VOCs............................................................................................ 17 <br /> 4.4.2.4 SVOCs.......................................................................................... 18 <br /> 4.4.2.5 Dissolved Metals........................................................................... 18 <br /> • 4.4.2.6 QA/QC Samples............................................................................ 18 <br /> 4.4.2.7 General Laboratory Notes............................................................. 19 <br /> 4.5 First Quarter 2008 SPH and Hydrocarbon Concentration Trends............................20 <br /> 4.5.1 Shallow Zone...............................................................................................20 <br /> 4.5.1.1 SPH ..............................................................................................20 <br /> 4.5.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations.....22 <br /> 4.5.2 Deep Zone...................................................................................................24 <br /> 4.5.2.1 SPH ..............................................................................................24 <br /> 4.5.2.2 Fuel Oxygenates and Hydrocarbon Concentrations......................24 <br /> 4.6 Arsenic....................................................................................................................26 <br /> 4.7 Purge Water Storage and Disposal.........................................................................26 <br /> 4.8 Requested Changes to Monitoring and Reporting Program ....................................26 <br /> 5.0 STATUS OF REMEDIATION ACTIVITIES......................................................................27 <br /> 5.1 DPE System............................................................................................................27 <br /> 5.2 Apartment SVE System...........................................................................................27 <br /> 5.3 SVE System............................................................................................................28 <br /> 6.0 SOIL VAPOR SAMPLING...............................................................................................29 <br /> 6.1 Previous Soil Vapor Sampling Activities..................................................................29 <br /> 6.2 Soil Vapor Sampling First Quarter 2008..................................................................29 <br /> 6.2.1 Soil Vapor Sampling....................................................................................29 <br /> 6.2.2 APSV Soil Vapor Concentrations.................................................................30 <br /> 6.2.2.1 APSV Trends ................................................................................30 <br /> 6.2.3 UPSV Soil Vapor Concentrations ................................................................30 <br /> 6.2.3.1 UPSV Trends................................................................................30 <br /> 6.2.4 QA/QC-Samples and General Laboratory Notes .........................................31 <br /> 6.2.4.1 First Quarter 2008; February 15, 2008..........................................31 <br /> 6.2.5 Conclusions and Recommendations............................................................31 <br /> 1 Q08QSSRQRSRQMR.Final.doc I April 30,2008 <br /> 771w.26397.42.1307 <br />